Free dynamic QR codes — editable & trackable

A static QR code has your destination baked into the pattern itself. Scanning it reads the URL straight out of the printed squares. That is fine until the destination changes — at which point the code is wrong, and the only fix is to reprint everything it was printed on.

A dynamic QR code encodes a short redirect URL instead. The pattern points at a link you control, and that link points at the destination. Change the destination and every code already printed starts sending people somewhere new, because the pattern never had to change.

The pattern is also simpler, which is a practical benefit rather than a cosmetic one. A short redirect URL needs fewer modules than a long link with campaign parameters, so the printed code stays readable at smaller sizes, on curved surfaces, and under the imperfect lighting of the real world.

Every scan is recorded after the redirect has already been issued, so measurement never delays or breaks the thing the person is trying to do. You see total scans over time, the device and operating system, the browser, and the country the scan came from.

The country is derived from the request and the IP address is discarded immediately — it is never written to storage. That keeps the analytics useful for the questions people actually ask of a print campaign (is this flyer working, are scans mostly iOS, which market responded) without accumulating a log of individuals who scanned a poster.

The redirect is issued as a temporary one rather than a permanent one, on purpose. A permanent redirect gets cached by browsers, which means repeat scans stop reaching the server and stop being counted — and worse, a cached permanent redirect keeps sending people to an old destination after you have changed it.

You can set foreground and background colours, add a logo in the centre, and choose the shape of the modules and corner markers. The constraint that matters is contrast: dark pattern on light background, with real separation between the two. Inverted codes and low-contrast pastel pairs fail on older scanners even when they look fine on screen.

A centre logo works because QR codes carry error correction — a portion of the pattern can be obscured and still decode. That budget is finite. A logo covering a modest area of the centre is safe; one that creeps outward eats the correction budget and starts producing codes that scan on a clean screen and fail on a scuffed printed label.

Keep the quiet zone — the clear margin around the pattern — and test the final artwork at the size it will actually be printed, with the phone you expect people to use. A code that scans from a 27-inch monitor at 300% zoom tells you very little about a code on a table tent in a dim room.